A Blockchain-Based Proxy Oriented Cloud Storage Public Audit Scheme for Low-Performance Terminal Devices

Due to the advantages of cloud computing, more and more people tend to store their data to cloud server (CS). Cloud storage audit scheme can help data owner (DO) to confirm the integrity of their stored data, but the existing schemes still have some limitations. Therefore, in this paper, we propose a blockchain-based proxy oriented cloud storage public audit scheme (BBPO-PA) for low performance terminal devices. Firstly, we employ a proxy that is authorized by DO. The proxy can process and upload ciphertext files for DO. Secondly, we introduce blockchain into our scheme and utilize smart contracts instead of centralized trusted third party audit (TPA) to improve the reliability and stability of audit results. Subsequently, the security analysis shows that our scheme has achieved the designed security goals. Finally, the performance evaluation demonstrates that our scheme has significant advantages over other schemes, in particular significantly reducing the resource overheads of DO.